... center 2.TTS intelligent digital voice alert system 3.can be managed,updated remotely gsm burglar alarm system CMS ,video burglar alarm system CMS for ... various access mode include 1 signaling , 7 signaling , common PSTN. All signaling mode can support 30 channel,60 channel,120 ... channel,1920 channel at most, common PSTN mode can support 4 channel,8channel,16 channel, at ...